预应力高强混凝土管桩抱箍式接头抗拔性能数值模拟研究  

Numerical Simulation on Uplift Performance of Hooped Joint of PHC Pipe Pile

作　　者：郝峰 刘佳龙 李媛媛[3] 蔡建国[3] HAO Feng;LIU Jialong;LI Yuanyuan;CAI Jianguo(State Grid Corporation of China,Beijing 100031,China;China Electric Power Research Institute,Beijing 100192,China;National Prestress Engineering Research Center,Southeast University,Nanjing 211189,China)

机构地区：[1]国家电网有限公司,北京100031 [2]中国电力科学研究院有限公司,北京100192 [3]东南大学国家预应力工程技术研究中心,南京211189

出　　处：《工业建筑》2022年第6期25-30,99,共7页Industrial Construction

基　　金：国家电网有限公司总部科技项目(5200-201918118A-0-0-00)。

摘　　要：预应力高强混凝土(PHC)管桩具有抗震性能好、单桩承载力大等优点,广泛应用于基础工程中。桩-桩接头的抗拔性能是接桩时需要考虑的关键问题之一。采用ABAQUS有限元软件建立抱箍式桩桩连接接头计算模型,对抱箍式桩-桩接头的抗拔受力机理进行了探究,考察了抱箍卡边缘宽度、径向厚度和端板厚度等参数对应力分布、抗拔承载力的影响。计算结果表明:U型抱箍卡的尺寸对节点的受拉破坏模式有一定影响;在加载至上拔设计荷载时,随着抱箍卡尺寸的增加,模型抱箍卡、端板和预应力筋的最大应力减小;随端板厚度增加,抱箍卡和端板最大应力减小,而预应力筋最大应力增加。PHC pipe pile has been widely used in foundation engineering due to its high seismic performance and large bearing capacity of single pile.The uplift resistance of pile-pile joints is one of the key issues to be considered when connecting piles.ABAQUS finite element software was used to establish the calculation model of the hooped joint of PHC pipe pile,and the mechanical mechanism of the joint was studied.The effects of the edge width,radial thickness and plate thickness on the stress distribution and the tensile capacity of hooped pile were investigated.The calculation results showed that the size of the U-shaped hoop had a certain influence on the failure mode of the joint under tension.When the load reaches the design load,the model’s maximum stress of the hoop,plate and prestressed reinforcement decreased with the increase of hoop size.With the increase of plate thickness,the maximum stress of hooped clamp and end plate decreased,while the maximum stress of prestressed tendon increased.

关 键 词：PHC管桩 抗拔性能 有限元分析 参数分析 

分 类 号：TU473.1[建筑科学—结构工程]